US20040011597A1 - Trolley wheel mechanism - Google Patents
Trolley wheel mechanism Download PDFInfo
- Publication number
- US20040011597A1 US20040011597A1 US10/440,164 US44016403A US2004011597A1 US 20040011597 A1 US20040011597 A1 US 20040011597A1 US 44016403 A US44016403 A US 44016403A US 2004011597 A1 US2004011597 A1 US 2004011597A1
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- United States
- Prior art keywords
- wheel
- trolley
- actuator
- brake
- response
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/02—Castors in general; Anti-clogging castors with disengageable swivel action, i.e. comprising a swivel locking mechanism
- B60B33/021—Castors in general; Anti-clogging castors with disengageable swivel action, i.e. comprising a swivel locking mechanism combined with braking of castor wheel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/0002—Castors in general; Anti-clogging castors assembling to the object, e.g. furniture
- B60B33/0015—Castors in general; Anti-clogging castors assembling to the object, e.g. furniture characterised by adaptations made to castor
- B60B33/0018—Castors in general; Anti-clogging castors assembling to the object, e.g. furniture characterised by adaptations made to castor in the form of a flat mounting plate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/0036—Castors in general; Anti-clogging castors characterised by type of wheels
- B60B33/0042—Double or twin wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/0047—Castors in general; Anti-clogging castors characterised by details of the rolling axle
- B60B33/0049—Castors in general; Anti-clogging castors characterised by details of the rolling axle the rolling axle being horizontal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/0047—Castors in general; Anti-clogging castors characterised by details of the rolling axle
- B60B33/0057—Castors in general; Anti-clogging castors characterised by details of the rolling axle the rolling axle being offset from swivel axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/006—Castors in general; Anti-clogging castors characterised by details of the swivel mechanism
- B60B33/0065—Castors in general; Anti-clogging castors characterised by details of the swivel mechanism characterised by details of the swivel axis
- B60B33/0068—Castors in general; Anti-clogging castors characterised by details of the swivel mechanism characterised by details of the swivel axis the swivel axis being vertical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/006—Castors in general; Anti-clogging castors characterised by details of the swivel mechanism
- B60B33/0065—Castors in general; Anti-clogging castors characterised by details of the swivel mechanism characterised by details of the swivel axis
- B60B33/0073—Castors in general; Anti-clogging castors characterised by details of the swivel mechanism characterised by details of the swivel axis the swivel axis being symmetrical to wheel or wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/0078—Castors in general; Anti-clogging castors characterised by details of the wheel braking mechanism
- B60B33/0081—Castors in general; Anti-clogging castors characterised by details of the wheel braking mechanism acting on tire tread
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/02—Castors in general; Anti-clogging castors with disengageable swivel action, i.e. comprising a swivel locking mechanism
- B60B33/025—Castors in general; Anti-clogging castors with disengageable swivel action, i.e. comprising a swivel locking mechanism by using form-fit, e.g. front teeth
Definitions
- the invention relates to trolleys, and more particularly to caster wheel mechanisms for trolleys.
- Caster wheels have been used for trolleys for many years. By virtue of their swivelling action they allow trolleys to be easily manoeuvred in confined spaces.
- British Patent Specification No. 1438530 describes a wheel mechanism in which a single handle is rotated through various angular positions for different modes of operation. It appears that a good deal of skill would be required to effectively use the handle and that it is likely to be accidently knocked into an undesired position.
- the invention is directed towards providing for simpler and easier user control of a trolley.
- a related object is to reduce risk of injury, such as back pain, for users, by reducing the push and pull forces required for a trolley.
- An example is movement of a trolley into and out of a galley in an airplane or train
- a trolley wheel mechanism comprising at least one caster wheel, a user actuator means, and means for applying a brake to the wheels according to user control of the actuator means, characterised in that,
- the mechanism further comprises means for retaining the wheel in an in-line position in a unidirectional mode in response to user control of the actuator means.
- the actuator means comprises an apply actuator and a release actuator
- the braking means comprises means for applying a brake to the wheel in response to a user input with the apply actuator, and for releasing the brake in response to a user input with the release actuator
- the retaining means comprises means for retaining the wheel in the unidirectional mode in response to user inputs with both actuators.
- the actuators are foot pedals.
- the retaining means comprises means for entering the unidirectional model in response to simultaneous depression of both pedals.
- the retaining means comprises a retaining lock on a wheel support or a mechanism frame member, the retaining lock comprising means for engagement in a retaining position upon swivelling of the wheel to an in-line position in the unidirectional mode.
- the retaining lock is mounted for engagement between a rotatable support for the wheel and the brake.
- the brake comprises means for movement between three operative positions as follows:
- the retaining lock is resilient for snap-fitting engagement upon swivelling of the wheel to an in-line position when the mechanism is in the unidirectional mode.
- the mechanism comprises at least two caster wheels for use on laterally opposed sides of a trolley.
- the braking means and the retaining means comprise an element which is movable between free, unidirectional, and braking positions in response to the actuator means.
- the element supports a brake, and the braking position is at a lowermost location of the element.
- the element engages with the retaining lock at its unidirectional position.
- the actuator means comprises a cam shaft mounted to move the element in response to user inputs.
- the mechanism further comprises an apply link means and a release link means interconnecting the release and apply actuators of the mechanism, and for connection with another mechanism.
- said link means comprises means for causing the apply actuator to move to a home position in response to a user input with the release actuator, and for causing the release actuator to move to a home position in response to a user input with the apply actuator.
- the invention provides a trolley comprising a trolley body and at least one wheel mechanism as defined above.
- FIG. 1 is a plan view of a wheel mechanism in a free mode (un-braked and unlocked), and
- FIG. 2 is a diagrammatic side view showing a wheel assembly for this mode and an enlarged view of connection between a cam and a plunger;
- FIG. 3( a ) is a plan view of the mechanism in an un-braked and retained position for a unidirectional mode
- FIG. 3( b ) is a perspective view of a wheel assembly
- FIG. 4 is a diagrammatic side view showing a wheel assembly for the unidirectional mode
- FIG. 5 is a plan view of the mechanism in a braking mode
- FIG. 6 is a diagrammatic side view showing a wheel assembly for this mode.
- FIGS. 7 ( a ) and 7 ( b ), and 7 ( c ) are diagrammatic side views illustrating a pedal mechanism of the wheel mechanism in the free, unidirectional, and braking modes respectively.
- a wheel mechanism 1 comprises a pair of wheel assemblies 2 interconnected by a cam shaft 3 .
- the mechanism 1 also comprises a release pedal 4 and an apply pedal 5 connected to the cam shaft 3 to rotate it to three operative positions, described below.
- the connection to the cam shaft 3 is via a pedal mechanism 6 .
- the pedal mechanism 6 is connected to link arms 7 and 8 to transfer pedal movements to another mechanism for the trolley, and vice versa. Also, the link arms 7 and 8 are interconnected as shown so that they transfer movement to each other.
- Each wheel assembly 2 comprises a base plate 10 for securing by bolts to the trolley (not shown).
- each wheel assembly 2 comprises a pair of side-by-side wheels 15 , and an inverted U-shaped bracket 16 supporting an axle 17 for the wheels 15 .
- the bracket 16 is part of a rotatable housing 18 supporting a resilient retainer lock 19 (which rotates with the housing).
- the base plate 10 supports a plunger 20 , the upper end of which has a face 21 engaging the cam 3 .
- the lower end of the plunger 21 is integral with a brake disc 22 for direct engagement with the wheels 15 .
- the plunger 20 is keyed on a central sleeve secured to the base plate 10 , and so does not rotate. Its only movement is translationally up and down. This movement is biassed upwardly by a helical spring 23 .
- the brake disc 22 includes a notch which is in registry with the resilient lock 19 when the wheels 15 are in an in-line (straight-ahead) position.
- the wheel assemblies In use, as shown in FIGS. 1 and 2 the wheel assemblies have a free mode at which the wheels are not braked and the housing 18 and wheels 15 are free to swivel through 360°. This mode is achieved after pressing the release pedal 4 , causing the cam shaft 3 to rotate so that its face faces the plunger 20 , allowing the plunger 20 to reach its highest position. As is clear from FIG. 2 the brake disc 22 is not in engagement with the wheels 15 and is not in engagement with the retainer lock 19 .
- FIGS. 3 and 4 a unidirectional mode is shown. This is achieved by the user pressing both of the pedals 4 and 5 simultaneously, causing the cam shaft 3 to rotate through 45°. This rotation pushes the plunger 20 downwardly against bias of the spring 23 to an intermediate position. At this position the brake disc 22 is still not in contact with the wheels 15 , however its notch is in engagement with the retainer lock 19 . If the two pedals 4 and 5 are pressed simultaneously when the wheels 15 are not in-line, as soon as the trolley is pushed they would swivel to the inline position and the notch would engage with the retainer lock 19 due to resilience of the lock 19 .
- FIGS. 5 and 6 a braking mode is illustrated. This is reached by the user pressing the brake apply pedal 5 , rotating the cam shaft 3 through 90° with respect to the free mode. This urges the plunger 20 to its lowermost position, at which the brake disc 22 is in contact with the wheels, and the retainer lock 19 is in engagement In this position there is neither swivelling or rotation of the wheels 15 .
- FIGS. 7 ( a ), 7 ( b ) and 7 ( c ) the pedal mechanism 6 is shown in more detail.
- a release part 6 ( a ) of the mechanism 6 is operated by the release pedal 4
- an apply part 6 ( b ) of the mechanism 6 is operated by the apply pedal 5 .
- the pedal mechanism 6 as a whole comprises a frame 30 , and the cam shaft 3 passes through it.
- the release part 6 ( a ) comprises a drive arm 31 welded to the cam shaft 3 at its inner end, and having a pin 32 at its outer end.
- the pin 32 is engaged with the link arm 7 , and an inner end of the release pedal 4 abuts against it.
- Rotation of the release pedal 4 is biased in the anti-clockwise direction about a pivot pin 40 by a nylon bias arm 33 .
- the nylon bias arm 33 is in turn biased in the clockwise direction by a helical spring 34 anchored on the frame 30 .
- the apply part 6 ( b ) of the pedal mechanism 6 is not directly connected to the cam shaft 3 .
- Rotation of the apply pedal 5 about a pivot pin 41 is biased in the anti-clockwise direction by a nylon bias arm 35 , itself biased in the clockwise direction by a helical spring 36 .
- the free mode is caused by the user pressing the release pedal 4 , and the apply pedal 5 is not moved. This is illustrated in FIG. 7( a ). Pressing the release pedal 4 causes two movements as follows:
- the unidirectional mode is caused by the user pressing both pedals 4 and 5 simultaneously. This action brings the two pedal mechanism parts 6 ( a ) and 6 ( b ) to an intermediate position as shown in FIG. 7( b ). The pressing actions cause corresponding movements in the pedals 4 and 5 of the other mechanism 1 via the links 7 and 8 .
- the braking mode is shown in FIG. 7( c ).
- the apply pedal 5 is pressed. This pulls the rod 8 to the left as viewed in FIG. 7( c ), in turn causing the release pedal 4 to rotate as shown in FIG. 7( c ).
- the invention provides for very simple and effective control. Only two pedals are required to provide the three modes of operation.
- the mechanism is also very compact. Another advantage is that it is of simple and robust construction.
Abstract
A trolley wheel mechanism (1) has two caster wheel assemblies (2) each having a pair of wheels (15) mounted on a rotatable housing (18). In a free mode the wheels (15) are free to both rotate and to swivel. This is caused by the user pressing a release pedal (4). In a unidirectional mode a retainer lock (19) engages a brake disc (22) to prevent swivelling of the housing (18). This is caused by the user pressing both pedals (4, 5) simultaneously. A brake mode is caused by the user pressing the apply pedal (5).
Description
- The invention relates to trolleys, and more particularly to caster wheel mechanisms for trolleys.
- Caster wheels have been used for trolleys for many years. By virtue of their swivelling action they allow trolleys to be easily manoeuvred in confined spaces.
- It is also known to provide a brake mechanism to prevent rotation of the wheels, and a lock mechanism to prevent swivelling of the wheels. British Patent Specification No. 1010363 describes such an arrangement. However, the action to prevent swivelling appears to lock the wheels at whichever swivel position they happen to be at. This is awkward for users. Also, little detail is disclosed about how the user operates the mechanisms.
- British Patent Specification No. 1438530 describes a wheel mechanism in which a single handle is rotated through various angular positions for different modes of operation. It appears that a good deal of skill would be required to effectively use the handle and that it is likely to be accidently knocked into an undesired position.
- The invention is directed towards providing for simpler and easier user control of a trolley. A related object is to reduce risk of injury, such as back pain, for users, by reducing the push and pull forces required for a trolley. An example is movement of a trolley into and out of a galley in an airplane or train
- According to the invention, there is provided a trolley wheel mechanism comprising at least one caster wheel, a user actuator means, and means for applying a brake to the wheels according to user control of the actuator means, characterised in that,
- the mechanism further comprises means for retaining the wheel in an in-line position in a unidirectional mode in response to user control of the actuator means.
- In one embodiment, the actuator means comprises an apply actuator and a release actuator, the braking means comprises means for applying a brake to the wheel in response to a user input with the apply actuator, and for releasing the brake in response to a user input with the release actuator, and wherein the retaining means comprises means for retaining the wheel in the unidirectional mode in response to user inputs with both actuators.
- In another embodiment, the actuators are foot pedals.
- In a further embodiment, the retaining means comprises means for entering the unidirectional model in response to simultaneous depression of both pedals.
- In one embodiment, the retaining means comprises a retaining lock on a wheel support or a mechanism frame member, the retaining lock comprising means for engagement in a retaining position upon swivelling of the wheel to an in-line position in the unidirectional mode.
- In another embodiment, the retaining lock is mounted for engagement between a rotatable support for the wheel and the brake.
- In one embodiment, the brake comprises means for movement between three operative positions as follows:
- a free position at which it is not applied to the wheel and it is not engaged with the retaining lock;
- a unidirectional position at which it is not applied to the wheel but is in engagement with the retaining lock for the unidirectional mode; and
- a braking position at which it is applied to the wheel.
- In one embodiment, the retaining lock is resilient for snap-fitting engagement upon swivelling of the wheel to an in-line position when the mechanism is in the unidirectional mode.
- In another embodiment, the mechanism comprises at least two caster wheels for use on laterally opposed sides of a trolley.
- In one embodiment, the braking means and the retaining means comprise an element which is movable between free, unidirectional, and braking positions in response to the actuator means.
- In another embodiment, the element supports a brake, and the braking position is at a lowermost location of the element.
- In a further embodiment, the element engages with the retaining lock at its unidirectional position.
- In one embodiment, the actuator means comprises a cam shaft mounted to move the element in response to user inputs.
- In another embodiment, the mechanism further comprises an apply link means and a release link means interconnecting the release and apply actuators of the mechanism, and for connection with another mechanism.
- In a further embodiment, said link means comprises means for causing the apply actuator to move to a home position in response to a user input with the release actuator, and for causing the release actuator to move to a home position in response to a user input with the apply actuator.
- According to another aspect, the invention provides a trolley comprising a trolley body and at least one wheel mechanism as defined above.
- The invention will be more clearly understood from the following description of some embodiments thereof, given by way of example only with reference to the accompanying drawings in which:—
- FIG. 1 is a plan view of a wheel mechanism in a free mode (un-braked and unlocked), and
- FIG. 2 is a diagrammatic side view showing a wheel assembly for this mode and an enlarged view of connection between a cam and a plunger;
- FIG. 3(a) is a plan view of the mechanism in an un-braked and retained position for a unidirectional mode, FIG. 3(b) is a perspective view of a wheel assembly, and
- FIG. 4 is a diagrammatic side view showing a wheel assembly for the unidirectional mode;
- FIG. 5 is a plan view of the mechanism in a braking mode, and
- FIG. 6 is a diagrammatic side view showing a wheel assembly for this mode; and
- FIGS.7(a) and 7(b), and 7(c) are diagrammatic side views illustrating a pedal mechanism of the wheel mechanism in the free, unidirectional, and braking modes respectively.
- Referring to FIG. 1, a
wheel mechanism 1 comprises a pair ofwheel assemblies 2 interconnected by acam shaft 3. Themechanism 1 also comprises arelease pedal 4 and an applypedal 5 connected to thecam shaft 3 to rotate it to three operative positions, described below. The connection to thecam shaft 3 is via apedal mechanism 6. Thepedal mechanism 6 is connected to linkarms link arms wheel assembly 2 comprises abase plate 10 for securing by bolts to the trolley (not shown). - Referring to FIG. 2 and FIG. 3(b), each
wheel assembly 2 comprises a pair of side-by-side wheels 15, and an invertedU-shaped bracket 16 supporting anaxle 17 for thewheels 15. Thebracket 16 is part of arotatable housing 18 supporting a resilient retainer lock 19 (which rotates with the housing). - The
base plate 10 supports aplunger 20, the upper end of which has aface 21 engaging thecam 3. The lower end of theplunger 21 is integral with abrake disc 22 for direct engagement with thewheels 15. Theplunger 20 is keyed on a central sleeve secured to thebase plate 10, and so does not rotate. Its only movement is translationally up and down. This movement is biassed upwardly by ahelical spring 23. Thebrake disc 22 includes a notch which is in registry with theresilient lock 19 when thewheels 15 are in an in-line (straight-ahead) position. - In use, as shown in FIGS. 1 and 2 the wheel assemblies have a free mode at which the wheels are not braked and the
housing 18 andwheels 15 are free to swivel through 360°. This mode is achieved after pressing therelease pedal 4, causing thecam shaft 3 to rotate so that its face faces theplunger 20, allowing theplunger 20 to reach its highest position. As is clear from FIG. 2 thebrake disc 22 is not in engagement with thewheels 15 and is not in engagement with theretainer lock 19. - Referring to FIGS. 3 and 4 a unidirectional mode is shown. This is achieved by the user pressing both of the
pedals cam shaft 3 to rotate through 45°. This rotation pushes theplunger 20 downwardly against bias of thespring 23 to an intermediate position. At this position thebrake disc 22 is still not in contact with thewheels 15, however its notch is in engagement with theretainer lock 19. If the twopedals wheels 15 are not in-line, as soon as the trolley is pushed they would swivel to the inline position and the notch would engage with theretainer lock 19 due to resilience of thelock 19. - In the unidirectional mode all wheels of the
mechanism 1 and any mechanism interlinked by thearms - Referring to FIGS. 5 and 6, a braking mode is illustrated. This is reached by the user pressing the brake apply
pedal 5, rotating thecam shaft 3 through 90° with respect to the free mode. This urges theplunger 20 to its lowermost position, at which thebrake disc 22 is in contact with the wheels, and theretainer lock 19 is in engagement In this position there is neither swivelling or rotation of thewheels 15. - The following summarises the overall operation of an aircraft trolley (cart) having a
mechanism 1 at each end. In this summary, therelease pedal 4 is coloured green and the applypedal 5 is coloured red. - Operator presses down both green and red pedals together and either pushes or pulls the cart in the aisle or into the galley space.
- All the casters are aligned simultaneously irrespective of wheel position and are held in the unidirectional mode.
- To release the cart from this mode press down the green pedal to home position (multidirectional). This is required when turning out of or into the galley.
- To re-establish the unidirectional mode press down both red and green pedals simultaneously.
- Press down the red pedal to apply brake.
- Just before the cart is about to be stored in the galley press both red and green pedals together. This will align casters in unidirectional mode. Then press red pedal when cart is stored.
- When removing cart from storage press both green and red pedals together, aft removal press the green pedal. This is required when turning out of or into the galley.
- Referring to FIGS.7(a), 7(b) and 7(c) the
pedal mechanism 6 is shown in more detail. A release part 6(a) of themechanism 6 is operated by therelease pedal 4, and an apply part 6(b) of themechanism 6 is operated by the applypedal 5. Thepedal mechanism 6 as a whole comprises aframe 30, and thecam shaft 3 passes through it. - The release part6(a) comprises a
drive arm 31 welded to thecam shaft 3 at its inner end, and having apin 32 at its outer end. Thepin 32 is engaged with thelink arm 7, and an inner end of therelease pedal 4 abuts against it. Rotation of therelease pedal 4 is biased in the anti-clockwise direction about apivot pin 40 by anylon bias arm 33. Thenylon bias arm 33 is in turn biased in the clockwise direction by ahelical spring 34 anchored on theframe 30. - The apply part6(b) of the
pedal mechanism 6 is not directly connected to thecam shaft 3. Rotation of the applypedal 5 about apivot pin 41 is biased in the anti-clockwise direction by anylon bias arm 35, itself biased in the clockwise direction by ahelical spring 36. - The free mode is caused by the user pressing the
release pedal 4, and the applypedal 5 is not moved. This is illustrated in FIG. 7(a). Pressing therelease pedal 4 causes two movements as follows: - (a) rotation of the
cam shaft 3 by abutment of therelease pedal 4 with the drive arm 31 (at the pin 32), and - (b) movement of the
link arm 7, in turn causing the applypedal 5 to move to a home position, and causing theother mechanism 1 at the other end of the trolley to enter the free mode. - The unidirectional mode is caused by the user pressing both
pedals pedals other mechanism 1 via thelinks - The braking mode is shown in FIG. 7(c). In this case the apply
pedal 5 is pressed. This pulls therod 8 to the left as viewed in FIG. 7(c), in turn causing therelease pedal 4 to rotate as shown in FIG. 7(c). - Interconnection by way of the
link arms mechanisms 1 at opposite ends of the trolley. - Press near apply
pedal 5 down to enter the braking mode (FIG. 7(c)). - Near
release pedal 4 goes up. -
Far release pedal 4 goes up. - Far apply
pedal 5 goes down. - The opposite is the case upon pressing the
release pedal 4 for the free mode (FIG. 7(a)): - Press near
release pedal 4 down. - Near apply
pedal 5 goes up. - Far apply
pedal 5 goes up. -
Far release pedal 4 goes down. - As shown in FIGS.1, 3(a), and 5 there is a spring-loaded ball catch 60 which is located for snap-fitting engagement with the apply
pedal 5 in the unidirectional mode. This adds to stability of all pedals because of their interconnections. There is no need for such a catch for the free or braking modes because the pedal positions are very stable for these modes. - It will be appreciated that the invention provides for very simple and effective control. Only two pedals are required to provide the three modes of operation. The mechanism is also very compact. Another advantage is that it is of simple and robust construction.
- It has been found that forces necessary to move an aircraft trolley in an out of a galley are considerably reduced if the control methodology set out in the example above is used. Because the operator can achieve all control with his or her feet and because of the reduced pushing and pulling forces there is a reduced risk of cumulative strain on operators. There is also less risk of accidentally bumping of objects or people.
- The invention is not limited to the embodiments described but may be varied in construction and detail.
Claims (16)
1. A trolley wheel mechanism comprising at least one caster wheel, a user actuator, and a brake mechanism for applying a brake to the wheels according to user control of the actuator, characterised in that,
the mechanism further comprises a retainer mechanism for retaining the wheel in an in-line position in a unidirectional mode in response to user control of the user actuator.
2. A trolley wheel mechanism as claimed in claim 1 , wherein the user actuator comprises an apply actuator and a release actuator, the brake mechanism comprises a mechanism for applying a brake to the wheel in response to a user input with the apply actuator, and for releasing the brake in response to a user input with the release actuator, and wherein the retainer mechanism comprises a retainer for retaining the wheel in the unidirectional mode in response to user inputs with both actuators.
3. A trolley wheel mechanism as claimed in claim 2 , wherein the actuators are foot pedals.
4. A trolley wheel mechanism as claimed in claim 3 , wherein the retainer mechanism comprises a retainer for entering the unidirectional model in response to simultaneous depression of both pedals.
5. A trolley wheel mechanism as claimed in claim 1 , wherein the retainer mechanism comprises a retaining lock on a wheel support or a mechanism frame member, the retaining lock comprises a lock mechanism for engagement in a retaining position upon swivelling of the wheel to an in-line position in the unidirectional mode.
6. A trolley wheel mechanism as claimed in claim 5 , wherein the retaining lock is mounted for engagement between a rotatable support for the wheel and the brake.
7. A trolley wheel mechanism as claimed in claim 6 , wherein the brake comprises a brake mechanism for movement between three operative positions as follows:
a free position at which it is not applied to the wheel and it is not engaged with the retaining lock;
a unidirectional position at which it is not applied to the wheel but is in engagement with the retaining lock for the unidirectional mode; and
a braking position at which it is applied to the wheel.
8. A trolley wheel mechanism as claimed in claim 5 , wherein the retaining lock is resilient for snap-fitting engagement upon swivelling of the wheel to an inline position when the mechanism is in the unidirectional mode.
9. A trolley wheel mechanism as claimed in claim 1 , wherein the mechanism comprises at least two caster wheels for use on laterally opposed sides of a trolley.
10. A trolley wheel mechanism as claimed in claim 1 , wherein the brake mechanism and the retainer mechanism comprise an element which is movable between free, unidirectional, and braking positions in response to the user actuator.
11. A trolley wheel mechanism as claimed in claim 10 , wherein the element supports a brake, and the braking position is at a lowermost location of the element.
12. A trolley wheel mechanism as claimed in claim 5 , wherein the element engages with the retaining lock at its unidirectional position.
13. A trolley wheel mechanism as claimed in claim 10 , wherein the user actuator comprises a cam shaft mounted to move the element in response to user inputs.
14. A trolley wheel mechanism as claimed in claim 2 , further comprising an apply link and a release link interconnecting the release and apply actuators, and for connection with another trolley wheel mechanism.
15. A trolley wheel mechanism as claimed in claim 14 , wherein said links cause the apply actuator to move to a home position in response to a user input with the release actuator, and cause the release actuator to move to a home position in response to a user input with the apply actuator.
16. A trolley comprising a trolley body and at least one wheel mechanism as claimed in claim 1.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IE20000949 | 2000-11-21 | ||
IE2000/0949 | 2000-11-21 | ||
IE20010347 | 2001-04-09 | ||
IES2001/0347 | 2001-04-09 | ||
PCT/IE2001/000146 WO2002042093A1 (en) | 2000-11-21 | 2001-11-21 | A trolley wheel mechanism |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IE2001/000146 Continuation WO2002042093A1 (en) | 2000-11-21 | 2001-11-21 | A trolley wheel mechanism |
Publications (2)
Publication Number | Publication Date |
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US20040011597A1 true US20040011597A1 (en) | 2004-01-22 |
US6843349B2 US6843349B2 (en) | 2005-01-18 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/440,164 Expired - Fee Related US6843349B2 (en) | 2000-11-21 | 2003-05-19 | Trolley wheel mechanism |
Country Status (8)
Country | Link |
---|---|
US (1) | US6843349B2 (en) |
EP (1) | EP1335837B1 (en) |
CN (1) | CN1274520C (en) |
AT (1) | ATE296729T1 (en) |
AU (1) | AU2002223976A1 (en) |
DE (1) | DE60111257T2 (en) |
IE (2) | IE20011002A1 (en) |
WO (1) | WO2002042093A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2002042093A1 (en) * | 2000-11-21 | 2002-05-30 | Arrow Technology Systems Limited | A trolley wheel mechanism |
US20070044272A1 (en) * | 2005-08-31 | 2007-03-01 | Siemens Medical Solutions Usa, Inc. | Activation mechanism for a locking mechanism of a caster |
US7698760B2 (en) * | 2005-11-17 | 2010-04-20 | Hill-Rom Services, Inc. | Hospital bed caster control system |
US7810822B2 (en) * | 2006-01-19 | 2010-10-12 | Hill-Rom Services, Inc. | Stretcher having hand actuated caster braking apparatus |
TWM325961U (en) * | 2006-09-29 | 2008-01-21 | Golden Point Marketing Ltd | Wheel brake for baby stroller |
DE102008021604B4 (en) * | 2008-04-30 | 2016-06-30 | Fresenius Medical Care Deutschland Gmbh | Device for actuating brake devices of a mobile device, mobile frame and medical device |
US8465030B2 (en) | 2008-12-07 | 2013-06-18 | Norduyn Inc. | Modular utility cart |
GB2480370B (en) | 2010-05-14 | 2017-03-29 | Norduyn Inc | Body reinforcement and method of manufacturing thereof |
EP2897849B1 (en) * | 2012-09-21 | 2016-11-23 | Jan Knijnenburg B.V. | Dolly |
CN103448773A (en) * | 2013-08-29 | 2013-12-18 | 成都国光电气股份有限公司 | Handcart brake |
DE102013020833A1 (en) * | 2013-12-12 | 2015-06-18 | Grenzebach Maschinenbau Gmbh | Driverless transport vehicle for the safe transport of heavy loads |
US9603764B2 (en) | 2014-02-11 | 2017-03-28 | Medline Industries, Inc. | Method and apparatus for a locking caster |
EP3318415B1 (en) * | 2016-11-03 | 2023-08-16 | Gaskari, Jalil | A lockable wheel assembly |
CN107898475B (en) * | 2017-12-14 | 2023-09-29 | 无锡祥生医疗科技股份有限公司 | Cart type ultrasonic diagnostic apparatus |
US11718128B2 (en) * | 2019-12-04 | 2023-08-08 | GE Precision Healthcare LLC | Ergonomic central wheel lock for ultrasound consoles |
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US4677706A (en) * | 1984-06-21 | 1987-07-07 | Colson Castors (Europe) Limited | Castor brake |
US4722114A (en) * | 1985-09-06 | 1988-02-02 | Tente-Rollen Gmbh & Co. | Caster device |
US4815161A (en) * | 1987-01-22 | 1989-03-28 | Skf Transportwielen B.V. | Swiveling wheel |
US5014391A (en) * | 1989-01-13 | 1991-05-14 | Arnolf Schulte | Lockable caster wheel |
US5303450A (en) * | 1991-11-16 | 1994-04-19 | Albert Schulte Sohne Gmbh & Co. | Caster for use on mobile hospital beds and the like |
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US6575052B2 (en) * | 2001-07-31 | 2003-06-10 | Ge Medical Systems Global Technology Company, Llc | Pedal mechanism for operating brake and directional lock on lever-operated caster wheels |
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WO2002042093A1 (en) * | 2000-11-21 | 2002-05-30 | Arrow Technology Systems Limited | A trolley wheel mechanism |
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2001
- 2001-11-21 WO PCT/IE2001/000146 patent/WO2002042093A1/en not_active Application Discontinuation
- 2001-11-21 CN CNB018191282A patent/CN1274520C/en not_active Expired - Fee Related
- 2001-11-21 IE IE20011002A patent/IE20011002A1/en not_active IP Right Cessation
- 2001-11-21 IE IE20011003A patent/IES20011003A2/en not_active IP Right Cessation
- 2001-11-21 DE DE60111257T patent/DE60111257T2/en not_active Expired - Lifetime
- 2001-11-21 AU AU2002223976A patent/AU2002223976A1/en not_active Abandoned
- 2001-11-21 AT AT01997400T patent/ATE296729T1/en not_active IP Right Cessation
- 2001-11-21 EP EP01997400A patent/EP1335837B1/en not_active Expired - Lifetime
-
2003
- 2003-05-19 US US10/440,164 patent/US6843349B2/en not_active Expired - Fee Related
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US4414702A (en) * | 1981-05-16 | 1983-11-15 | Firm Tente-Rollen Gesellschaft Mit Beschrankter Haftung Compagnie | Castor locking device for arresting the rotation and the swivelling of the castor |
US4677706A (en) * | 1984-06-21 | 1987-07-07 | Colson Castors (Europe) Limited | Castor brake |
US4722114A (en) * | 1985-09-06 | 1988-02-02 | Tente-Rollen Gmbh & Co. | Caster device |
US4815161A (en) * | 1987-01-22 | 1989-03-28 | Skf Transportwielen B.V. | Swiveling wheel |
US5014391A (en) * | 1989-01-13 | 1991-05-14 | Arnolf Schulte | Lockable caster wheel |
US5303450A (en) * | 1991-11-16 | 1994-04-19 | Albert Schulte Sohne Gmbh & Co. | Caster for use on mobile hospital beds and the like |
US5377372A (en) * | 1993-03-31 | 1995-01-03 | Hill-Rom Company, Inc. | Hospital bed castor control mechanism |
US5450639A (en) * | 1993-12-21 | 1995-09-19 | Hill-Rom Company, Inc. | Electrically activated visual indicator for visually indicating the mode of a hospital bed castor |
US5503416A (en) * | 1994-03-10 | 1996-04-02 | Oec Medical Systems, Inc. | Undercarriage for X-ray diagnostic equipment |
US5579871A (en) * | 1995-05-31 | 1996-12-03 | Lermer Corporation | Brake assembly for rollable utility carts |
US6321878B1 (en) * | 1999-03-05 | 2001-11-27 | Hill-Rom Services, Inc. | Caster and braking system |
US20020033307A1 (en) * | 1999-03-05 | 2002-03-21 | Mobley Donald L. | Hospital bed caster and braking system |
US6575052B2 (en) * | 2001-07-31 | 2003-06-10 | Ge Medical Systems Global Technology Company, Llc | Pedal mechanism for operating brake and directional lock on lever-operated caster wheels |
Also Published As
Publication number | Publication date |
---|---|
DE60111257T2 (en) | 2006-03-16 |
EP1335837A1 (en) | 2003-08-20 |
IE20011002A1 (en) | 2002-10-16 |
US6843349B2 (en) | 2005-01-18 |
IES20011003A2 (en) | 2002-09-18 |
AU2002223976A1 (en) | 2002-06-03 |
CN1274520C (en) | 2006-09-13 |
WO2002042093A8 (en) | 2002-06-20 |
DE60111257D1 (en) | 2005-07-07 |
CN1474754A (en) | 2004-02-11 |
EP1335837B1 (en) | 2005-06-01 |
ATE296729T1 (en) | 2005-06-15 |
WO2002042093A1 (en) | 2002-05-30 |
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Legal Events
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AS | Assignment |
Owner name: ARROW TECHNOLOGY SYSTEMS, LIMITED, IRELAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WALSH, THOMAS DONAL;TIERNEY, PATRICK;REEL/FRAME:014095/0036 Effective date: 20030508 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20090118 |